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MdeModulePkg BootScriptExecutorDxe: Convert IA32/S3Asm.asm to NASM 

Use real nasm instruction to replace DB bytes.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>
This commit is contained in:
Liming Gao 2016-06-12 16:25:20 +08:00
parent 0ed65cc2f9
commit 9fa08ee485
1 changed files with 13 additions and 12 deletions
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25
MdeModulePkg/Universal/Acpi/BootScriptExecutorDxe/IA32/S3Asm.nasm
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@ -39,21 +39,22 @@ ASM_PFX(AsmTransferControl):
shrd ebx, ecx, 20
and ecx, 0xf
mov bx, cx
mov [@jmp_addr], ebx
mov [@jmp_addr + 1], ebx
retf
BITS 16
.0:
DB 0xb8, 0x30, 0 ; mov ax, 30h as selector
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
mov ss, ax
mov ax, 0x30
o32 mov ds, eax
o32 mov es, eax
o32 mov fs, eax
o32 mov gs, eax
o32 mov ss, eax
mov eax, cr0 ; Get control register 0
DB 0x66
DB 0x83, 0xe0, 0xfe ; and eax, 0fffffffeh ; Clear PE bit (bit #0)
DB 0xf, 0x22, 0xc0 ; mov cr0, eax ; Activate real mode
DB 0xea ; jmp far @jmp_addr
@jmp_addr: DD 0
and eax, 0x0fffffffe ; Clear PE bit (bit #0)
mov cr0, eax ; Activate real mode
@jmp_addr:
jmp 0x0:0x0
global ASM_PFX(AsmTransferControl32)
ASM_PFX(AsmTransferControl32):